1. Arc Length and Sector Area

2. Warm-Up
Complete # 5, 8, 13, 14 on worksheet!

3. Notecard Warm Up – To be Turned In
Write your name on the notecard
On the provided notecard, write the formula for the area of the following:
Rectangle
Triangle
Square
Trapezoid
Parallelogram
Regular Polygon
Rhombus
Kite

4. Homework Check
172.8in in m2
m m cm2
in = cm2
9. <1=120, <2=60, <3=30
10. <4=90, <5=45, <6=45
11. <7=60, <8=30, <9=60
12. <1=36, <2=18, <3=72

5. Extra Practice 200cm2 2. 525in2 3. 432m2 4. 33.8cm2 5. 216in2 6. 116
11. 80in in2
cm2

6. Quiz

7. Today’s Objective
Students will be able to calculate the length of an arc and the area of a sector.

8. 7-6 Arc Length
Review: The Circumference is the distance around a circle.
C=2πr or C=πd
Definition: The Arc Length is the distance around an arc (a fraction of the circumference)
Arc length is DIFFERENT from Arc Measure****

9. Arc Length: is a fraction of a circle’s circumference (in terms of pi) Arc Measure: is equal to the central angle (in terms of degrees)

10. Example
Find the LENGTH of arc AB

11. Ex 2: Find the length of arc ADB

14. 7-7 Sector Area Review: The Area of a circle is π*r2
Definition: A Sector is a region bounded by an arc and two radii

18. Is a part of a circle bounded by an arc and the segment joining its endpoints

19. Area of a Segment

20. Ex 1: Find the area of the segment:

21. Ex 2:

22. Challenge: Find the area of the shaded region
12cm

23. Challenge Find the area of the green figure.

24. Classwork/Homework
Worksheet
Review for Test